滚圈疲劳损伤危险点应力-时间历程数值模拟

Stress-time history numerical simulation in roller's fatigue damage

为了更加科学准确地编制滚圈疲劳损伤危险点的疲劳载荷谱,以广泛应用于大型回转窑的箱型滚圈为研究对象,对滚圈进行了力学分析,确定了滚圈与筒体、托轮接触的边界条件。综合考虑力和温度的影响因素,建立了滚圈托轮的接触体系模型。针对孔缘危险点,分别作滚圈最低点的孔中心处于0°、3.75°、7.5°三个时刻的稳态热力耦合有限元分析,选取滚圈圆周方向上的应力作为疲劳载荷谱的载荷应力,得出了孔缘危险点的疲劳载荷谱,该载荷谱反映出了温度和截面周期性变化对应力状态的影响,为后续的滚圈强度与疲劳寿命分析提供依据。

In order to compile fatigue load spectrum at risk spot on roller more scientifically and accurately,the trunk roller applied to large-scale rotary kiln widely was investigated,mechanics analysis of roller was made,contact boundary of roller ,kiln and pad were ascertained. The contact system model between roller and pad was established, influencing factor of force and temperature were considered, steady state coupling heat-structure analysis was operated at risk spot around hole while the lowest hole of roller at 0°,3.75°,7.5°, considered circumferential stress load stress in fatigue load spectrum, the fatigue load spectrum at risk spot around hole was gained. This load spectrum reflects the impact of temperature and periodical section change on the stress state,and it provides the bases for the establishment of intensity and fatigue life analysis.